They should allow it to function without any external RAM.
1,914 karma · joined June 11, 2023
Local-only commands removal: We are removing known mechanisms for creating a local account in the Windows Setup experience (OOBE). While these mechanisms were often used to bypass Microsoft account setup, they also inadvertently skip critical setup screens, potentially causing users to exit OOBE with a device that is not fully configured for use. Users will need to complete OOBE with internet and a Microsoft account, to ensure device is setup correctly.It's disappointing that phones' firmware doesn't already do this if the call fails to go through via the SIM card. It should be required.
Now this is all unless there is some weird injection method that doesn't show up in the transcripts.
[1] https://www.wiphone.io/FAQ.html (under CAN YOU ADD A SIM CARD...)